CVE-2026-77791

7.5 highEPSS 0.7%

High (7.5). EPSS 0.7% chance of exploitation in the next 30 days.

Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack. This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
CWE: CWE-400
Published: 2026-09-23
Modified: 2026-09-23
Record from: the NVD, synced 2026-10-19

References

https://lists.apache.org/thread/mb1pjjooqytrl6hbvbt3rw1lqwlon4cz
http://www.openwall.com/lists/oss-security/2026/09/23/24

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